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为什么树懒这么慢

But this diet has its drawbacks.

但这种饮食有其缺点。

Animals extract energy from food and use that energy to move around,

动物们从食物中提取能量，并用这种能量来移动，

maintain their body temperature, keep their organs working, and all the other activities necessary for survival.

来保持体温，保持器官正常运作和维持生存必要的其它活动。

英语相关

But leaves don't contain much energy, and that which they do have is tough to extract.

但叶子的能量含量并不高，这仅有的能量又很难提取。

Most herbivores supplement a leafy diet with higher energy foods like fruit and seeds.

大多数食草动物在吃叶子的同时也会食用其它更高能量的食物，比如水果和籽类。

But sloths, especially three-toed sloths, rely on leaves almost exclusively.

但树懒，特别是三趾树懒，几乎只吃叶子。

They've evolved finely tuned strategies for coping with this restricted diet.

为了以这样的饮食习惯生存下去，它们进化出了特别的习性。